Demonstrator for engine oil additive



FIG. 1 is an isometic view from an upper aspect of a demonstrator or engine oil additive, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof; and

FIG. 6 is a left side elevational view thereof. 

The ornamental design for demonstrator for engine oil additive, substantially as shown. 